4239857 has 2 divisors, whose sum is σ = 4239858. Its totient is φ = 4239856.

The previous prime is 4239853. The next prime is 4239877. The reversal of 4239857 is 7589324.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3936256 + 303601 = 1984^2 + 551^2 .

It is a cyclic number.

It is not a de Polignac number, because 4239857 - 2² = 4239853 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 4239857.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4239853) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2119928 + 2119929.

It is an arithmetic number, because the mean of its divisors is an integer number (2119929).

Almost surely, 2^4239857 is an apocalyptic number.

It is an amenable number.

4239857 is a deficient number, since it is larger than the sum of its proper divisors (1).

4239857 is an equidigital number, since it uses as much as digits as its factorization.

4239857 is an evil number, because the sum of its binary digits is even.

The product of its digits is 60480, while the sum is 38.

The square root of 4239857 is about 2059.0913044350. The cubic root of 4239857 is about 161.8516270920.

The spelling of 4239857 in words is "four million, two hundred thirty-nine thousand, eight hundred fifty-seven".